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level3 Typography: How can we use bootstraps to make our lead text stand out more? .lead class centering text： using the .text-* in bootstrap front we 阅读全文
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level2 responsive design rows: columns: we can use multiple columns: we can use .col-md-* we can do something like this Adding row, make code easier t 阅读全文
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level 1 framework defination： bootstrap file structure: Adding bootstrp to our html: bootstrap relays on jquery, so we also need to add jquery inside 阅读全文